Image scanning apparatus and method

Details Image scanning apparatus and method Image scanning apparatus and method

1994-07-25

1996-06-18

Rosenberger, Richard A.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356241, 356378, G01B 1100

Patent

active

055283594

ABSTRACT:
An image scanning apparatus and method for automatically inspecting a product having light transmission regions, so as to detect any defect therein with accuracy and rapidity. The image scanning method inspects the product by disposing a light source on one side of the product and an optical sensor on the other side thereof, varying the incidence angle of a light output emitted from the light source to the light transmission regions of the product, then receiving, by the optical sensor, the light transmitted through the light transmission regions at each of the varied incidence angles, thereby acquiring image data with regard to the product, and detecting any defect in the product on the basis of the image data thus obtained at the incidence angles. The image scanning apparatus comprises a light source disposed on one side of the product to be inspected, an optical sensor disposed on the other side thereof, a means for varying the incidence angle of a light output emitted from the light source to the light transmission regions of the product, and a means for processing the image data obtained with regard to the product at each of the varied incidence angles.

REFERENCES:
patent: 3806252 (1974-04-01), Harris et al.
patent: 3873211 (1975-03-01), Watson
patent: 4687328 (1987-08-01), Shiraishi et al.
patent: 4930889 (1990-06-01), Van Donselaar et al.

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